ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
78 lines
1.2 KiB
Markdown
78 lines
1.2 KiB
Markdown
---
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id: 5900f37d1000cf542c50fe8f
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title: 问题16：电源数字总和
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challengeType: 5
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videoUrl: ''
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dashedName: problem-16-power-digit-sum
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---
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# --description--
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2 <sup>15<!-- sup-->= 32768，其位数之和为3 + 2 + 7 + 6 + 8 = 26。 2 <sup><code>指数<!-- code--><!-- sup-->的数字总和是多少？</code></sup></sup>
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# --hints--
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`powerDigitSum(15)`应该返回26。
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```js
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assert.strictEqual(powerDigitSum(15), 26);
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```
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`powerDigitSum(128)`应该返回166。
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```js
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assert.strictEqual(powerDigitSum(128), 166);
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```
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`powerDigitSum(1000)`应返回1366。
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```js
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assert.strictEqual(powerDigitSum(1000), 1366);
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```
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# --seed--
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## --seed-contents--
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```js
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function powerDigitSum(exponent) {
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return true;
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}
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powerDigitSum(15);
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```
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# --solutions--
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```js
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function powerDigitSum(exponent) {
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const bigNum = [1];
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let sum = 0;
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for (let i = 1; i <= exponent; i++) {
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let count = bigNum.length + 1;
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let overflow = 0;
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for (let j = 0; j < count; j++) {
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let digit = bigNum[j] || 0;
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digit = 2 * digit + overflow;
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if (digit > 9) {
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digit -= 10;
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overflow = 1;
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} else {
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overflow = 0;
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}
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bigNum[j] = digit;
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}
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}
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bigNum.forEach(function(num) {
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return sum += num;
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});
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return sum;
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}
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```
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